Management of computer systems by using a hierarchy of autonomic management elements

ABSTRACT

A method and system for managing a computing system by using a hierarchy of autonomic management elements are described. The autonomic management elements operate in a master-slave mode and negotiate a division of management responsibilities regarding various components of the computing system.

RELATED APPLICATIONS

This application is a Continuation of the U.S. application Ser. No.13/448,084 filed on Apr. 16, 2012, which is a continuation of U.S.application Ser. No. 12/118,697 filed on May 10, 2008, which has nowissued as a U.S. Pat. No. 8,161,478 on Apr. 17, 2012, which claimsbenefit from the U.S. provisional application Ser. No. 60/917,095 filedMay 10, 2007 entitled “Management of Computer System Using a Hierarchyof Autonomic Management Systems”, entire contents of all patentapplications and the issued patent being incorporated herein byreference.

FIELD OF THE INVENTION

The present invention relates to autonomic computing, and in particular,to the management of computer systems by using a hierarchy of autonomicmanagement elements.

BACKGROUND OF THE INVENTION

The increasing complexity and diversity of current computer systems havemade the existing computer infrastructure difficult to manage andinsecure. This has led researchers to consider an alternative approachfor computer systems design, which is based on principles used bybiological systems to deal with complexity, heterogeneity anduncertainty, the approach being referred to as autonomic computing.Autonomic computing is a new paradigm in computing systems design forcomputer systems that are self-configuring, i.e. automaticallyconfiguring components, self-healing, i.e. automatically discovering andcorrecting faults, self-optimizing, i.e. automatically monitoring andcontrolling resources to ensure the optimal functioning with respect tothe defined requirements, and self-protecting, i.e. providing proactiveidentification and protection from arbitrary attacks. Autonomiccomputing solves the management problem of today's complex computingsystems by embedding the management of such systems inside the systemsthemselves, freeing users from potentially overwhelming details.

An Embot™, one form of an autonomic management element for computersystems (and other systems), has been developed by the applicant asdescribed in the articles by Tony White et al. entitled “Design of anAutonomic Element for Server Management” and “Autonomic Control forServers: Why Management Plane Makes Sense”, both of which areincorporated herein by reference. In the present patent application theterms “Embot™” and “autonomic management element” will be considered assynonyms and used interchangeably throughout the patent application.

Normally, the autonomic management element is designed to manageeverything in a computer system from the physical hardware through theoperating system (OS) up to and including software applications. So far,an existing development of autonomic management elements has beenlimited to situations where only one autonomic management element hasbeen required.

However, in view of the ever growing complexity of computer systems,there are numerous situations where a plurality of autonomic managementelements need to operate in agreement to provide a holistic managementof the entire computer system.

Accordingly, there is a need in the industry for the development of animproved computer system having two or more autonomic managementelements, along with the methods for appropriate management of such acomputer system, including multiple guest operating systems running onthe computer system and their respective software applications.

SUMMARY OF THE INVENTION

Therefore there is an object of the present invention to provide animproved method and system for managing a computing system by using ahierarchy of autonomic management elements.

According to one aspect of the invention, there is provided a method formanaging a computing system having hardware and software components, themethod comprising the steps of:

(a1) launching two or more autonomic management elements, each runningin a different component of the computing system;(b1) negotiating a division of management responsibilities between thetwo or more autonomic management elements regarding selected componentsof the computing system; and(c1) managing said selected components of the computing system by thetwo or more autonomic management elements according to the division ofmanagement responsibilities.

The method further comprises the steps of:

(a2) arranging the hardware and software components of the computingsystem in a hierarchy of layers, comprising a lowest layer, a highestlayer and one or more intermediate layers, the step being performedbefore the step (a1); andwherein the step (a1) comprises configuring the autonomic managementelements as masters or slaves depending on their respective positions inthe hierarchy of layers, and running the autonomic management elementsin a master-slave mode, wherein a master controls the managementresponsibilities of a slave.

The step (a1) further comprises:

(a3) configuring the autonomic management element running in thecomponent occupying the lowest layer as the master for all otherautonomic management elements;(b3) configuring the autonomic management element running in thecomponent occupying the highest layer as the slave for all otherautonomic management elements; and(c3) configuring the autonomic management element running in thecomponent occupying the intermediate layer as the master for theautonomic management elements running in the components occupying layersabove the intermediate layer, and as the slave for the autonomicmanagement elements running in the components occupying layers below theintermediate layer.

The step (b1) further comprises the steps of:

(a4) determining a position of the layer in said hierarchy of layersoccupied by the component in which the autonomic management element isrunning; and(b4) executing any one or more of the following steps based on theposition of the layer determined in the step (a4):(b4i) negotiating the division of management responsibilities as themaster for the autonomic management elements running in the componentsoccupying layers above the layer occupied by the component in which theautonomic management element is running; and(b4ii) negotiating the division of management responsibilities as theslave for the autonomic management elements running in the componentsoccupying layers below the layer occupied by the component in which theautonomic management element is running.

The step (b4i) further comprises the steps of:

(a5) for an autonomic management element, listening for a connectionrequest from the slave for the autonomic management element;(b5) assuming the management responsibilities regarding the component inwhich the autonomic management element is running before the arrival ofthe connection request from the slave; and(c5) communicating with the slave for the autonomic management elementregarding the division of management responsibilities after the arrivalof the connection request from the slave.

The step (b4ii) further comprises the steps of:

(a6) for an autonomic management element, sending a connection requestto the master for the autonomic management element;(b6) assuming the management responsibilities regarding the component inwhich the autonomic management element is running before the connectionrequest sent in the step (a6) is satisfied;(c6) communicating with the master for the autonomic management elementregarding the division of management responsibilities after theconnection request sent in step (a6) is satisfied; and(d6) accepting the division of management responsibilities regarding theselected components sent by the master for the autonomic managementelement.

The step (c5) further comprises the step of exchanging informationincluding a unique token identifying a connection with the slave, thestep being performed after the step (b5).

The step (c6) further comprises the step of exchanging informationincluding a unique token identifying a connection with the master, thestep being performed after the step (b6).

According to another aspect of the invention, there is provided a methodfor managing a computing system having components, including a hardwareplatform, an operating system or a hypervisor, one or more guestoperating systems and software applications, the method comprising thesteps of:

(a9) arranging the components of the computing system in a hierarchy oflayers, comprising a lowest layer, a highest layer and one or moreintermediate layers;(b9) launching autonomic management elements, each running in adifferent component of the computing system; configuring the autonomicmanagement elements as masters or slaves depending on their respectivepositions in the hierarchy of layers, and running the autonomicmanagement elements in a master-slave mode, wherein a master controlsthe management responsibilities of a slave;(c9) negotiating a division of management responsibilities between theautonomic management elements regarding selected components of thecomputing system; and(d9) managing said components of the computing system by the autonomicmanagement elements according to the division of managementresponsibilities performed in step (c9).

The step (b9) further comprises the steps of:

(a10) configuring the autonomic management element running in thecomponent occupying the lowest layer as the master for all otherautonomic management elements;(b10) configuring the autonomic management element running in thecomponent occupying the highest layer as the slave for all otherautonomic management elements; and(c10) configuring the autonomic management element running in thecomponent occupying the intermediate layer as the master for theautonomic management elements running in the components occupying layersabove the intermediate layer and as the slave for the autonomicmanagement elements running in the components occupying layers below theintermediate layer.

The step (c9) further comprises the steps of:

(a11) determining a position of the layer in said hierarchy of layersoccupied by the component, in which the autonomic management element isrunning; and(b11) executing any one or more of the following steps based on theposition of the layer determined in the step (a11):(b11i) negotiating the division of management responsibilities as themaster for the autonomic management elements running in the componentsoccupying layers above the layer occupied by the component, in which theautonomic management element is running; and(b11ii) negotiating the division of management responsibilities as theslave for the autonomic management elements running in the componentsoccupying layers below the layer occupied by the component in which theautonomic management element is running.

The step (b11i) further comprises:

(a12) for an autonomic management element, listening for a connectionrequest from the slave for the autonomic management element;(b12) assuming the management responsibilities regarding the component,in which the autonomic management element is running before the arrivalof the connection request from the slave; and(c12) communicating with the slave for the autonomic management elementregarding the division of management responsibilities after the arrivalof the connection request from the slave.

The step (b11ii) further comprises:

(a13) for an autonomic management element, sending a connection requestto the master for the autonomic management element;(b13) assuming the management responsibilities regarding the component,in which the autonomic management element is running before theconnection request sent in the step (a13) is satisfied;(c13) communicating with the master for the autonomic management elementregarding the division of management responsibilities after theconnection request sent in step (a13) is satisfied; and(d13) accepting the division of management responsibilities regardingthe selected components sent by the master for the autonomic managementelement.

According to yet another aspect of the invention, there is provided amethod for managing a computing system having components including ahardware platform, a hypervisor, a guest operating system and anapplication, the method comprising the steps of:

(a14) arranging the components of the computing system in a hierarchy oflayers, in which the hardware platform occupies a lowest layer, thehypervisor occupies a second layer, the guest operating system occupiesa third layer and the application occupies a fourth layer;(b14) launching three autonomic management elements, one running in thehardware platform, one running in the hypervisor and one running in theguest operating system; configuring the autonomic management elements asmasters or slaves depending on their respective positions in thehierarchy of layers, and running the autonomic management elements in amaster-slave mode, wherein a master controls the managementresponsibilities of a slave;(c14) negotiating a division of management responsibilities between thethree autonomic management elements regarding selected components of thecomputing system; and(d14) managing said selected components of the computing system by thethree autonomic management elements according to the division ofmanagement responsibilities.

The step (b14) further comprises the steps of:

(a15) configuring the autonomic management element running in thehardware platform as the master for all other autonomic managementelements;(b15) configuring the autonomic management element running in the guestoperating system as the slave for all other autonomic managementelements; and(c15) configuring the autonomic management element running in thehypervisor as the master for the autonomic management element running inthe guest operating system and as the slave for the autonomic managementelement running in the hardware platform.

The step (c14) further comprises the steps of:

(a16) determining a position of the layer in said hierarchy of layersoccupied by the component, in which the autonomic management element isrunning; and(b16) executing any one or more of the following steps based on theposition of the layer determined in the step (a16):(b16i) negotiating the division of management responsibilities as themaster for the autonomic management elements running in the componentsoccupying layers above the layer occupied by the component, in which theautonomic management element is running; and(b16ii) negotiating the division of management responsibilities as theslave for the autonomic management elements running in the componentsoccupying layers below the layer occupied by the component in which theautonomic management element is running.

According to one more aspect of the invention, there is provided methodfor managing a computing system having components including a hardwareplatform, a hypervisor, a guest operating system and an application, themethod comprising the steps of:

(a17) arranging the components of the computing system in a hierarchy oflayers, in which the hardware platform occupies a lowest layer, thehypervisor occupies a second layer, the guest operating system occupiesa third layer and the application occupies a fourth layer;(b17) launching two autonomic management elements, running in thehardware platform, and in the guest operating system; configuring theautonomic management elements as masters or slaves depending on theirrespective positions in the hierarchy of layers, and running theautonomic management elements in a master-slave mode, wherein a mastercontrols the management responsibilities of a slave;(c17) negotiating a division of management responsibilities between thetwo autonomic management elements regarding selected components of thecomputing system; and(d17) managing said selected components of the computing system by thetwo autonomic management elements according to the division ofmanagement responsibilities.

The step (b17) further comprises the steps of:

(a18) configuring the autonomic management element running in thehardware platform as the master for the other autonomic managementelement; and(b18) configuring the autonomic management element running in the guestoperating system as the slave for the other autonomic managementelement.

The step (c17) further comprises the steps of:

(a19) determining a position of the layer in said hierarchy of layersoccupied by the component, in which the autonomic management element isrunning; and(b19) executing any one of the following steps based on the position ofthe layer determined in the step (a19):(b19i) negotiating the division of management responsibilities as themaster for the autonomic management element running in the guestoperating system; and(b19ii) negotiating the division of management responsibilities as theslave for the autonomic management element running in the hardwareplatform.

According to yet another aspect of the invention, there is provided amethod for managing a computing system having components including ahardware platform, an operating system and an application, the methodcomprising the steps of:

(a20) arranging the components of the computing system in a hierarchy oflayers, in which the hardware platform occupies a lowest layer, theoperating system occupies a second layer, and the application occupies athird layer;(b20) launching two autonomic management elements, running in thehardware platform, and in the operating system; configuring theautonomic management elements as masters or slaves depending on theirrespective positions in the hierarchy of layers, and running theautonomic management elements in a master-slave mode, wherein a mastercontrols the management responsibilities of a slave;(c20) negotiating a division of management responsibilities between thetwo autonomic management elements regarding selected components of thecomputing system; and(d20) managing said selected components of the computing system by thetwo autonomic management elements according to the division ofmanagement responsibilities.

The step (b20) further comprises the steps of:

(a21) configuring the autonomic management element running in thehardware platform as the master for the other autonomic managementelement; and(b21) configuring the autonomic management element running in theoperating system as the slave for the other autonomic managementelement.

The step (c20) further comprises the steps of:

(a22) determining a position of the layer in said hierarchy of layersoccupied by the component, in which the autonomic management element isrunning; and(b22) executing any one of the following steps based on the position ofthe layer determined in the step (a22):(b22i) negotiating the division of management responsibilities as themaster for the autonomic management element running in the operatingsystem; and(b19ii) negotiating the division of management responsibilities as theslave for the autonomic management elements running in the hardwareplatform. According to one more aspect of the invention, there isprovided a system for managing a computing system having hardware andsoftware components, comprising:two or more autonomic management elements, each running in a differentcomponent of the computing system, and comprising a respective Embot™Mediation Service module, negotiating a division of managementresponsibilities between the autonomic management elements for managingselected hardware and software components of the computing system.

According to yet one more aspect of the invention, there is provided asystem for managing a computing system having hardware and softwarecomponents arranged in a hierarchy of layers including a lowest layer, ahighest layer and one or more intermediate layers, the systemcomprising:

-   -   two or more autonomic management elements, each running in a        different component of the computing system, each autonomic        management element comprising:        (a24) a Platform Mediation Service module determining a position        of the layer in said hierarchy of layers occupied by the        component in which the autonomic management element is running        for configuring the autonomic management element as a master or        slave depending on its respective position in the hierarchy of        layers, and for running the autonomic management element in a        master-slave mode, wherein a master controls the management        responsibilities of a slave; and        (b24) an Embot™ Mediation Service module negotiating a division        of management responsibilities between the masters and slaves        for managing selected components of the computing system.

In the system described above, the Embot™ Mediation Service modulefurther comprises:

(a25) a Persistent Data Storage module storing information regarding themasters and the slaves;(b25) an Auto-Discovery module connecting the slave to the master; and(c25) a Command Processor module processing commands from the master andthe slave that communicate with each other.

Beneficially, the system further comprises:

(a26) a Communication Protocols module supporting communication betweenthe master and the slave;(b26) a Registration Service module controlling access to registrationinformation including contact information for the slaves and masters forthe autonomic management element;(c26) a Configuration Service module providing resource configurationinformation including the location of the autonomic management elements;and(d26) a Delegation Service module providing information regarding thedivision of management responsibilities between the masters and slaves.

The system further comprises a Heartbeat Module maintaining a continuouscommunication between the master and the slave.

According to one more aspect of the invention, there is provided asystem for managing a computing system having components including ahardware platform, a hypervisor, a guest operating system and anapplication, arranged in a hierarchy of layers, in which the hardwareplatform occupies a lowest layer, the hypervisor occupies a secondlayer, the guest operating system occupies a third layer and theapplication occupies a fourth layer, the system comprising:

three autonomic management elements, one running in the hardwareplatform, one running in the hypervisor and one running in the guestoperating system; each autonomic management element comprising:

(a28) a Platform Mediation Service module determining a position of thelayer in said hierarchy of layers occupied by the component in which theautonomic management element is running for configuring the autonomicmanagement element as a master or slave depending on its respectiveposition in the hierarchy of layers, and for running the autonomicmanagement element in a master-slave mode, wherein a master controls themanagement responsibilities of a slave; and(b28) an Embot™ Mediation Service module negotiating a division ofmanagement responsibilities between the masters and slaves for managingselected components of the computing system.

The Embot™ Mediation Service module further comprises:

(a29) a Persistent Data Storage module storing information regarding themasters and the slaves;(b29) an Auto-Discovery module connecting the slave to the master; and(c29) a Command Processor module processing commands from the master andthe slave that communicate with each other.

The system further comprises:

(a30) a Communication Protocols module supporting communication betweenthe master and the slave;(b30) a Registration Service module controlling access to registrationinformation including contact information for the slaves and masters forthe autonomic management element;(c30) a Configuration Service module providing resource configurationinformation including the location of the autonomic management elements;and(d30) a Delegation Service module providing information regarding thedivision of management responsibilities between the masters and slaves.

The system further comprises a Heartbeat Module maintaining a continuouscommunication between the master and the slave.

According to one more aspect of the invention, there is provided asystem for managing a computing system having components including ahardware platform, a hypervisor, a guest operating system and anapplication, arranged in a hierarchy of layers, in which the hardwareplatform occupies a lowest layer, the hypervisor occupies a secondlayer, the guest operating system occupies a third layer and theapplication occupies a fourth layer, the system comprising:

two autonomic management elements, one running in the hardware platform,and one running in the guest operating system; each autonomic managementelement comprising:

(a32) a Platform Mediation Service module determining a position of thelayer in said hierarchy of layers occupied by the component in which theautonomic management element is running for configuring the autonomicmanagement element as a master or slave depending on its respectiveposition in the hierarchy of layers, and for running the autonomicmanagement element in a master-slave mode, wherein a master controls themanagement responsibilities of a slave; and(b32) an Embot™ Mediation Service module negotiating a division ofmanagement responsibilities between the masters and slaves for managingselected components of the computing system.

According to yet one more aspect of the invention, there is provided asystem for managing a computing system having components including ahardware platform, an operating system and an application, arranged in ahierarchy of layers, in which the hardware platform occupies a lowestlayer, the operating system occupies a second layer and the applicationoccupies a third layer, the system comprising:

-   -   two autonomic management elements, one running in the hardware        platform, and the other one running in the operating system;        each autonomic management element comprising:        (a33) a Platform Mediation Service module determining a position        of the layer in said hierarchy of layers occupied by the        component in which the autonomic management element is running        for configuring the autonomic management element as a master or        slave depending on its respective position in the hierarchy of        layers, and for running the autonomic management element in a        master-slave mode, wherein a master controls the management        responsibilities of a slave; and        (b33) an Embot™ Mediation Service module negotiating a division        of management responsibilities between the masters and slaves        for managing selected components of the computing system.

A computer program product for managing a computing system havinghardware and software components, comprising a computer readable mediumhaving computer program code means embodied in said medium for causingsaid computer to perform the steps of the method described above is alsoprovided.

BRIEF DESCRIPTION OF DRAWINGS

Further features and advantages of the invention will be apparent fromthe following description of the embodiment, which is described by wayof example only and with reference to the accompanying drawings inwhich:

FIG. 1 illustrates a computer system according to the embodiment of thepresent invention having two autonomic management elements that arerespectively placed in the hardware platform and within the operatingsystem;

FIG. 2 a illustrates a computer system according to another embodimentof the present invention where two autonomic management elements arerespectively placed in the hardware platform and within the operatingsystem;

FIG. 2 b illustrates a computer system according to another embodimentof the present invention where two autonomic management elements arerespectively placed in the hardware platform and within the hypervisor;

FIG. 3 a illustrates a portion of the Service Oriented Framework (SOF)for the autonomic management element according to the embodiments of thepresent invention;

FIG. 3 b illustrates the software architecture of the Embot™ MediationService of FIG. 3 a;

FIG. 4 illustrates the steps performed by an autonomic managementelement to configure itself as a master/slave;

FIG. 5 illustrates the steps performed by an autonomic managementelement operating as a slave;

FIG. 6 illustrates the steps performed by an autonomic managementelement operating as a master; and

FIG. 7 illustrates the steps performed by a master and a slave after asuccessful connection has been established.

DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION

FIGS. 1 and 2 illustrate respective computer systems 100 and 200, havingmore than one autonomic management elements in accordance with theembodiments of the present invention.

FIG. 1 illustrates a computer system 100 including a hardware platform11, an operating system 12 and a plurality of applications 13, runningon top of the operating system 12. There are two autonomic managementelements in the computer system 100. An autonomic management element 14(Embot™) is placed within the hardware platform 11 and another autonomicmanagement element 16 is placed (In-Band) within the operating system(Embot™ 16).

FIG. 2 a shows a computer system 200 with a virtualized environment thatincludes the hardware platform 11 and an operating system 12. Guest OS132, Guest OS2 34 and Guest OS3 36 represent additional virtualizedoperating systems (guest operating systems) that are running on top ofthe operating system 12. Guest OS1 32, Guest OS2 34 and Guest OS3 36 runtheir respective software applications labeled 22, 24 and 26respectively. As in FIG. 1, an autonomic management element or Embot™ 14is placed in the hardware platform. Another autonomic management element16 is located within the operating system 12.

FIG. 2 b shows a computer system 250 in which the guest operatingsystems are running on top of a hypervisor 30 with its Virtual MachineManager (VMM) 20. The hypervisor 30 replaces the operating system 12 ofthe computer system 200, where an autonomic management element 18 isplaced within the hypervisor 30. All other components of the computersystem 250 are the same as in the computer system 200 shown in FIG. 2 a.Computer systems, such as the ones shown as 200 and 250, have a layeredarchitecture and the hardware and software components of the computersystem are organized in a hierarchy of layers. The hardware platformoccupies the lowest layer whereas the operating system 12 or thehypervisor 30 occupies the next layer. The guest operating systems arelocated in the third layer whereas the applications lie in the fourthlayer. Although the example computer systems 200 and 250 containautonomic management elements at the first and the second layers,autonomic management elements can be placed at higher layers as well.

When the autonomic management element is placed at the lowest layer inthe hardware platform 11 (e.g., autonomic management element 14 in FIGS.2 a and 2 b), it has the advantage of surviving any catastrophicproblems occurring in any of the above layers. This means the autonomicmanagement element survives any problem within the operating system 12,and in any virtualized guest operating systems, such as Guest OS1 32 toGuest OS3 36 that are running on top of the operating system 12 andtheir respective applications 22, 24, 26. However, in this situation,the autonomic management element 14 has issues with available resourcessince hardware implementations typically have constricted resources,which makes it difficult for the autonomic management element 14 tohandle the entire computer system, e.g., the entire computer system 200,having multiple guest operating systems and software applications, asthe situation would be in a virtualized environment, which isillustrated in FIG. 2 a.

In contrast, when the autonomic management element 16 of FIG. 1 isplaced within the OS 12, it now has the advantage of significantresources made available to it, but is susceptible to any type offailure within the operating system including crashes, main powerfailures, user error, malware, etc.

With the advancements in virtualization, running in the hypervisor 30,shown in FIG. 2 b, has all the benefits of resources, allowing theEmbot™ 18 of FIG. 2 b to manage multiple disparate guest operatingsystems and applications without suffering any of the OS problems in aspecific virtualized guest OS. However, the Embot™ 18 relies on mainpower supplied by the hardware platform 11 and basic services providedby the operating system 12 or hypervisor 30, and therefore is stillsusceptible to problems, some of which are described in the previouslyfiled patent application, cited above, and are related to the separationof management and service in a virtualized environment.

Once an autonomic management element is installed and running within acomputer system, it needs to be aware of the potential for otherautonomic management elements to co-exist. When another autonomicmanagement element has been detected, the process of negotiation anddividing management responsibilities between the autonomic managementelements begins.

FIG. 3 a illustrates a simplified structure of the autonomic managementelement 14, 16 or 18, which is a Service Oriented Framework (SOF) with agroup of dynamically installed, configured and run services.

Surrounding the core 40 of the Embot™ is a series of “MediationServices”, which abstract direct calls to the components in which theEmbot™ runs, e.g., the hardware platform 11, the operating system 12 orthe hypervisor 30 that enables virtualization. Four primary modules ofthe Mediation Services are shown in FIG. 3 a, namely Platform MediationServices module 42, Host Mediation Services module 44, Embot™ MediationServices module 46, and Console/Notification Services module 48.

Each of the Mediation Services modules 42, 44, 46 and 48 can dynamicallyload up code or services as needed from respective repositories, orrequest and download new code or services as required from an externalconsole. Two of these modules, the Platform Mediation Services module 42and the Embot™ Mediation Services module 46 are of interest for thepresent invention. The modules comprise a firmware, or alternatively, acomputer software code stored in a computer readable medium such as asemiconductor memory, flash memory, Compact Disc (CD) or DigitalVersatile Disc (DVD) to be executed by a processor.

The Console/Notification Interface Services module 48 providescommunication to external consoles, and the Host Mediation Servicesmodule 44 provides an abstract interface to multiple operating systemsas well as software applications that the autonomic management element14 needs to manage.

The Platform Mediation Services module 42 provides an abstract interfaceto the component on which the autonomic management element is running.This service provides detection routines to independently determine theplatform that the autonomic management element is running on, along withother information, code or services required for the autonomicmanagement element 14 to operate fully.

The Embot™ Mediation Services module 46 provides an abstractedcommunications interface for interconnecting with other autonomicmanagement elements within the computer system.

As described earlier, the computer system, comprising components thatinclude a hardware platform 11, an operating system 12 or a hypervisor30, and other guest operating systems including software applications,is characterized by a hierarchy of layers. Thus, a correspondinghierarchy of layers is formed for autonomic management elements, suchthat a layer of the computer system may have a corresponding autonomicmanagement placed within the layer. The autonomic management elementsoperate on the layer in which they are installed and above.

According to the embodiments of the present invention, the autonomicmanagement elements work in a master-slave fashion and each autonomicmanagement element is configured to operate as a master or a slave withregard to another autonomic management element in the computer systemthrough its Embot™ Mediation Services module 46. Each autonomicmanagement element operates as a master with regard to the autonomicmanagement elements that are running in the above layers, and operatesas a slave with regard to the autonomic management elements that arerunning in the layers below. Clearly, the autonomic management elementat the lowest layer operates as a master only due to the absence of anylower layer autonomic management element. Similarly, the autonomicmanagement element at the highest layer operates as a slave only due tothe absence of any higher layer autonomic management element. Anautonomic management element in any intermediate layer operates both asa master and a slave. It is a master to the upper layer autonomicmanagement elements and a slave to the lower layer autonomic managementelements.

The software architecture for the Embot™ Mediation Service 46 ispresented in FIG. 3 b. The Embot™ Mediation Service includes a few basicmodules: a Delegation Service module 52, a Registration Service module54, a Configuration Service module 56, the Heartbeat Service module 58,the Command Processor Service module 60, the Communication Protocolsmodule 64 and the Auto-Discovery module 62. A Persistent Data Storagemodule 50 is used for storing the data required for handling theautonomic management elements. The modules comprise a firmware, oralternatively, a computer software code, which is stored in a computerreadable medium, such as a semiconductor memory, flash memory, CD orDVD. A brief description of each of these modules is presented next.

The Communication Protocols module 64 deals with connections between anEmbot™ and anything else that it may attempt to connect; the preferredconnection method is based on network protocols. This component containsall appropriate protocols when installed on its target. However, attimes, the preferred connection method may not be available (e.g. theEmbot™ in firmware may only have the ability to use Direct Memory Access(DMA) based memory transfers to communicate).

The Auto-Discovery module 62 is used by a slave Embot™ and assists inconnecting a slave and master Embot™ together. The master awaits anincoming slave at a known location depending on the communicationprotocols that are available. The slave, depending on configuration,calls upon the Auto-Discovery module 62 to connect to a master.

The slave can be configured in many ways—this configuration is used bythe Auto Discovery module 62 when it is called. The different possibleconfigurations include the following.

-   -   Manual configuration: This allows the end-user to set a target        master for a slave in advance, it is used mainly to get past        communication issues that can occur in some edge cases.    -   Network-Based configuration: includes two types of network-based        configurations that are discussed. One uses the Dynamic Host        Configuration Protocol (DHCP) and the other is subnet-based.        -   DHCP-based: When retrieving an IP address for an Embot™,            there may be a known value for the master stored as a custom            option.        -   Subnet: The subnet is scanned for any IP address that has a            known port open. This known port is an Internet Assigned            Numbers Authority (IANA) registered known port.    -   DMA-based configuration: First contact is made to a known base        memory address, after which data exchange may be over different        addressing. This information is communicated within the        information provided at the base memory address.

The Command Processor module 60 accepts commands from the slave/masterat the other end of the connection. The commands include the following:

-   -   DiscoverMaster: Used by a slave to start auto discovery and        create a connection with a master.    -   RegisterWithMaster: Allows a slave to register with the master.        The slave provides the master with the following information:        -   the layer at which the slave is        -   which slaves this slave is a master of        -   current resource profile of this slave        -   current responsibilities: that include the responsibilities            this slave (and slaves controlled by this slave as a master)            are already managing.

The master determines the division of management responsibilities: whatresponsibilities it will allow the slave to manage and whatresponsibilities it will manage by itself. The master may use thefollowing commands.

-   -   acceptSlave: The master returns the list of responsibilities        delegated to the slave as well as information about its master        (if one exists). This last piece of information is used in error        conditions like lost heartbeat. A heartbeat message is sent out        periodically when no other normal communication occurs between        the master and the slave to ensure that these entities are        active and running.    -   redirectSlave: The master may inform the slave to connect to a        different master; this is used to correct previous error        conditions like lost heartbeat.    -   DelegateTasks: Used by a master to tell a slave to accept new        responsibilities or tasks when another slave or the master is no        longer able to do them.    -   UpdateResources: Used to update a master or a slave with change        in resource configuration information. This may force a        RenegotiateResponsibilities if changes in resources/capabilities        mean that a slave or master can no longer handle its        responsibilities.    -   RenegotiateResponsibilities: Identical to register but presumes        the slave is already in the Persistent Data Storage module 50.    -   RequestCurrentDelegatedTasks: Used by a master or its slave to        ask for a current list of responsibilities or tasks that is        assigned to the other.    -   RedirectSlaveToMaster: Used by a master to instruct a slave to        reconnect to a different master. This is used to reconnect a        slave to its proper master in an appropriate layer.

The Registration Service 54 module controls access to registrationinformation stored within the Persistent Data Storage module 50. For agiven autonomic management element, it keeps the last contactinformation on all slaves in the components located in the layers aboveit as well as the master in the layer below it (if available). Thiscomponent is enabled on master only if/when a slave connects, theregistration service is started.

The Configuration Service module 56 controls access to configurationinformation within the Persistent Data Storage module 50. It deals withthe current resources, the current responsibilities and the currentheartbeat timeout value, as it may need adjustment depending on thecommunication protocol in use and latency.

The Delegation Service module 52 controls access to responsibilityinformation within the persistent data. It deals with:

-   -   stack information—concerning layers that can potentially exist.        For example:        -   layer for the base hardware            -   Embot™ may be in firmware            -   Embot™ may be on adjunct hardware e.g. a PCI card or a                USB key        -   layer for the hypervisor            -   Embot™ is in the privileged domain        -   layer for the OS            -   Embot™ may be within a single OS on base hardware            -   Embot™ may be within a Guest OS within the hypervisor or                some virtualization software    -   Information on layers that currently exist: marks which layers        are active and require management.    -   current responsibilities: tracks currently registered/live        slaves and the components they are managing.

The Heartbeat Service module 58 deals with ensuring a continuousconnection between a master and its slaves. At both the master and theslave side of a connection, it sends messages out at regular intervals(as long as no other type of message is sent). Any non-heartbeat messagebetween a slave and its master updates the heartbeats' last contactinformation and resets the heartbeat timeout. If a heartbeat is lost(diagnosed when a series of heartbeat messages are not being receivedduring a given timeout period), an event returns to the commandprocessor to correct the situation (depending on master or slave). Inthe case of a slave, the following operations are performed:

-   -   An attempt to reconnect to the last master as well as its        master's master (if that information was provided during        RegisterWithMaster) is made until it reconnects to any master.        If the slave connects, the new master is now the slave's master,        the slave updates its information, discarding what it knew about        a previous master. It will reconnect to its old master if its        new master sends a RedirectSlaveToMaster command.    -   Takes over the master's responsibilities, when possible, after a        predetermined timeout, and records/reports the current        situation.

In the case of a master, it will remove the slave from registration, andif necessary, assume the responsibilities of the slave or delegate theseresponsibilities to another more capable slave if possible.

The operation of the autonomic management elements are described in moredetail with regard to FIG. 4 to FIG. 7, which are presented next.

Flowchart 400, shown in FIG. 4, illustrates the steps executed by anautonomic management element to determine at which layer it is runningso that it can appropriately configure itself as a master and/or aslave. Upon start (box 402), the procedure 400 checks whether or not itis running in the hardware platform that is situated in the lowest layerof the hierarchy of components (box 404). If it is running in the lowestlayer, the procedure 400 exits “Yes” from box 404, and configures theautonomic management element as a master (box 406) and exits (box 410).If the autonomic management element is running in a higher layer, theprocedure 400 exits “No” from box 404, and configures the autonomicmanagement element both as a master and as a slave (box 408) and exits(box 410). An autonomic management element in an intermediate layerserves as a master for upper layer autonomic management elements and asa slave for lower layer autonomic management elements. Please note thatan autonomic management element in the highest layer of the hierarchy isa special case and has no slave autonomic element to manage. However, itserves as a slave for lower layer autonomic management elements.Although it is configured both as a master and a slave, its role as amaster never gets activated by an incoming slave and it plays the roleof a slave only. This is discussed further in a later paragraph.

Flowchart 500 shown in FIG. 5 illustrates the steps executed by anautonomic management element after it is configured as a slave forassuming the role of the slave. Upon start (box 502), the procedure 500attempts to discover a master autonomic management element (box 504).The autonomic management element that serves as the master lies in alayer that is located in a layer that is lower than the layer in whichthe slave autonomic management element is located. The procedure 500then checks whether or not a master was found (box 506). If found, itexits “Yes” from box 506 and goes to connect with the master (box 508).Otherwise, it exits “No” from box 506, and if it is already not managingthe component in which it is running, it assumes the managementresponsibilities for this component and starts full management of thecomponent (box 512). Then the procedure 500 sleeps for a predeterminedinterval of time (box 514) and goes to the entry of box 504 for tryingto discover the master. After exiting from box 508, the procedure 500checks whether it was able to connect to the master (box 510). Ifsuccessfully connected it exits (box 518). Otherwise, it goes to theentry of box 512 for managing the component in which it is running.

Flowchart 600 shown in FIG. 6 illustrates the steps executed by anautonomic management element after it is configured as a master forassuming the role of the master. Upon start (box 602), the procedure 600sets up a listener for listening to a connection request from a slave(box 604). It then starts listening for a request to arrive from a slave(box 606). Whether or not a connection with the slave is established ischecked next (box 608). If successfully connected with the slave, theprocedure 600 exits (box 612). Otherwise, it sleeps for a predeterminedinterval of time (box 610) and goes to the entry of box 606 to listenfor a request to arrive from the slave. Before a connection with theslave is established the master assumes the management responsibilitiesfor the component in which it is running and starts full management ofthe component. Please note that when an autonomic management element isrunning in the highest layer executes the steps of the procedure 600, itnever receives a request from a slave, and thus never operates as amaster.

Flowchart 700, shown in FIG. 7, illustrates the steps performed by amaster and a slave autonomic management element after a successfulconnection has been established between the two. Upon start (box 702),the procedure 700 performs an exchange of an identification token thatuniquely identifies this connection with the other autonomic managementelement (box 704). The token and information regarding this connectionis then stored (box 706). This information is useful for auto-reconnectsat future restarts. Basic resource information is exchanged and thedivision of management responsibilities is negotiated (box 708). Theprocedure 700 then performs the exchange of policy information asrequired (box 710) and exits (box 712). Policies, in this context, arethe instructions in which an Embot™ will enforce on a particularcomponent. These policies are described in more detail in previouspatent documentation.

Autonomic management elements can run in various layers of the hierarchyof layers. If an autonomic management element is running at the highestlayer, it runs as a slave and executes the steps of the procedure 500outlined in FIG. 5. Similarly, an autonomic management element runningin the lowest layer runs as a master and executes the steps of theprocedure 600 presented in FIG. 6. An autonomic management elementrunning in an intermediate layer is configured both as a master and aslave and executes the steps of both the procedures captured in the flowcharts shown in FIGS. 5 and 6. A description of how the hierarchy ofautonomic management elements handles a number of specific situations ispresented next.

Restart Procedure

The behavior of the hierarchy of autonomic management elements when thesystem restarts after a failure is described. On a restart, the mastertries to manage the system up to the point that it negotiated away in aprevious session and starts that responsibility right away. The masterwaits for a brief time interval at startup to reconnect with slaves ithas connected to in the past, in case the slave does not return after arestart. If a connection with the slaves is not made, the master marksthe slaves as being in a questionable state, assumes their duties andtakes over management on the slaves' behalf.

If the slave reconnects sometime in the future, negotiation will occuras if this was a first contact situation.

On a restart, a slave immediately attempts to connect to the knownmaster rather than starting a new auto-discovery.

If the slave is unable to connect to the known master within apredetermined time interval, the slave attempts to contact the master ofits master (if known—this was exchanged during “acceptSlave”),otherwise, it returns to auto-discovery mode and attempts to findanother master. This is important for situations where the masterautonomic management element, running in the hardware platform 11, failsto come up after restart.

Placement of an Autonomic Management Element within a Hypervisor 30

When the autonomic management element determines that it is runningwithin a hypervisor, it configures itself as both master and slave. Theslave immediately attempts to find the autonomic management element inthe hardware platform 11 corresponding to the lowest layer of thehierarchy of layers. If located, they exchange a unique identificationtoken with each other and store communications information as describedearlier in FIG. 7 so that they can auto-reconnect at future restarts asa master/slave pair. At the same time, the master goes into a listeningmode waiting for other autonomic management elements from the guestoperating systems to request for connections.

Thus, an autonomic management element in each layer understands itsposition in the hierarchy of layers as well as the role it is playing.All autonomic management elements running within guest operating systemsnaturally seek out the autonomic management element running within thehypervisor 30, located in the adjacent lower layer first, rather thanthe autonomic management element running within the hardware platform11, located in the lowest layer of the hierarchy of layers. Byestablishing the hierarchy of layers of autonomic management elementsearly on, it simplifies the delegation of responsibilities betweenvarious autonomic management elements, and also simplifies handlingerror conditions, i.e. if one autonomic management element stopsrunning, then an autonomic management element of another layer takesover responsibility.

Master/Slave Interactions and the Negotiation of Responsibility

The process of negotiating the division of management responsibilitiesregarding selected components of the computing system is discussed. Themaster controls this process and makes its determinations based on anumber of items passed in by the slave. The simplest decisions are madearound resources. If the autonomic management element is running in thehardware platform 11, it will more likely delegate all managementresponsibilities excluding platform management and the lowest layers ofmanagement to the slave running in the layer above. Examples ofresponsibilities delegated to the slave include monitoring OS 12start/stop/restart or similar elements for a hypervisor 30. If theautonomic management element is running within a hypervisor, it willnaturally take care of managing the hypervisor 30 as well as the lowestlevels of each of the virtualized guest OSs. A similar operation isperformed when the guest OS is run on top of an OS 12 (instead of ahypervisor).

Two specific examples that involve the negotiation and delegation ofresponsibilities between autonomic management elements of various layersare presented next.

Example 1 Negotiations Between Master Running in the Hardware Platform11 and an Incoming Slave at any Layer

-   -   1. The master running within the hardware platform starts up and        immediately manages at least the component it resides within as        well as the OS 12 or the hypervisor 30 above it, which ever is        present. It will also continue managing previous        layers/components of the computer system it had managed before.        For example, the master may not have been contacted by a slave        in the past, and therefore was managing the entire computer        system.    -   2. If a slave connects, the slave informs the master which        policies the slave is currently managing (if any) as well as at        what layer the slave is working. If this layer is in between the        two already managing layers, then the division of management        responsibilities are automatically renegotiated starting at the        bottom layer.    -   3. The master initiates the division of management        responsibilities and forms a policy list by combining the slave        policy list to its own policy list and removing duplicates.        Based on the updated policy list, the master instructs the slave        which policies to stop managing.    -   4. Each layer of the computer system provides information        regarding other layers it is communicating with. This        information is necessary to effectively handle failures of        components at any layer.    -   5. If the master is communicating with an existing slave, which        resides in the higher layer that is below the layer in which the        incoming slave is residing, the master sends information to the        existing slave to communicate with the incoming slave as its        master. This will cause the above layer to start a new        negotiation as a master with each slave that connects to it.    -   6. Each layer remembers its current state for use in the next        startup cycle.

Example 2 Master Running within the Hardware Platform 11 is Connected toan Autonomic Management Element Running within a Hypervisor 30, and theAutonomic Management Element within the Hypervisor 30 Stops

In this example, one or more guest OSs are running on top of thehypervisor 30. Thus, the autonomic management element running within thehypervisor 30 is a slave for the autonomic management element runningwithin the hardware platform 11 and a master for the autonomicmanagement element running within any guest OS.

Let us assume the following.

-   -   1. Let us assume that, while all layers of the computer system        are running, and management is occurring at each layer as per        Example 1 described above, the autonomic management element        within the hypervisor 30 fails, e.g., due to fault or some other        issue.    -   2. All higher layer slaves, upon detecting the loss of their        master, immediately try to connect to their previous masters as        the autonomic element running within the hypervisor 30 may be        restarting. While this activity continues, the higher layer        slaves continue to manage items and applications of the computer        system they have already been managing. After a predetermined        timeout period, each slave will connect to the master of the        autonomic management element within the hypervisor 30 as        indicated during negotiation. If this information is not        available, each slave will attempt to look for another master.    -   3. The lower level master, upon detecting the loss of a slave,        immediately takes over responsibility of the layer above.    -   4. As each slave connects to the new master, they proceed as        described in Example 1 above.    -   5. Each layer remembers its current state for use in the next        startup cycle.

In more advanced cases, these boundaries of responsibilities may beblurred, and decisions may be made on application priorities, e.g., topreserve resources for a particular software application. Alternatively,the separation of management responsibilities between various levelautonomic management elements may be manually configured, which isespecially important if resources of a particular computer system arelimited, and the end-user will need to decide what management policiesshould be run on the computer system. Various other modifications may beprovided as needed. It is therefore to be understood that within thescope of the given system characteristics, the invention may bepracticed otherwise than as specifically described herein.

A computer readable medium, such as CD, DVD, non-volatile memory, or thelike, comprising computer code instructions stored thereon, which whenexecuted by a computer, perform the steps of the methods described aboveis also provided.

The computer system of the embodiments of the invention comprises acomputer having a processor and a memory, storing computer codeinstructions, which, when executed, perform the steps of the methodsdescribed above. Subsets of the computer code instructions stored in thememory form respective modules and means of the computer system, whichprovide corresponding functionality for the system as described indetail in the section “detailed description of the embodiments of theinvention” above.

Although the embodiment of the invention has been described in detail,it will be apparent to one skilled in the art that variations andmodifications to the embodiment may be made within the scope of thefollowing claims.

What is claimed is:
 1. A method for managing a computing system havinghardware and software components, comprising: arranging the hardware andsoftware components of the computing system in a hierarchy of layers;launching two autonomic management elements, each running in a differentcomponent of the computing system; configuring the two autonomicmanagement elements as a master and a slave, the master controllingmanagement responsibilities of the slave, provided the two autonomicmanagement elements are running in different layers; and managing thehardware and software components of the computing system by the twoautonomic management elements, comprising running the two autonomicmanagement elements in a master-slave mode.
 2. The method of claim 1,further comprising launching, by the slave, an automatic discoveryprocedure, based on a communication protocol, to discover andcommunicate with the master.
 3. The method of claim 2, furthercomprising, upon successful automatic discovery procedure, registeringthe slave with the master, comprising reporting: a layer where the slaveis located; and other slaves for which the slave is a master.
 4. Themethod of claim 3, wherein the reporting further comprises reporting:current resource profile of the slave; and current managementresponsibilities of the slave and the other slaves.
 5. The method ofclaim 2, further comprising, upon successful automatic discoveryprocedure: accepting the slave by the master; and delegating selectedmanagement tasks from the master to the slave.
 6. The method of claim 5,further comprising, upon successful automatic discovery procedure:redirecting the slave to another master; or re-negotiating managementresponsibilities between the master and the slave.
 7. The method ofclaim 1, wherein the configuring comprises configuring the two autonomicelements according to one or more of the following: manualconfiguration; network-based configuration; or direct memory accessconfiguration.
 8. The method of claim 2, wherein the launching theautomatic discovery procedure further comprises: by the master,listening for a connection request from the slave; and upon arrival ofthe connection request, communicating with the slave regarding adivision of the management responsibilities between the master and theslave.
 9. The method of claim 2, wherein the launching the automaticdiscovery procedure further comprises: by the slave, sending aconnection request to the master; and upon confirmation of theconnection request, communicating with the master regarding a divisionof the management responsibilities between the master and the slave. 10.The method of claim 1, wherein: the arranging further comprisesarranging the hardware components in the lowest layer; and theconfiguring further comprises configuring an autonomic managementelement occupying the lowest layer as the master for the other autonomicmanagement element.
 11. The method of claim 1, wherein the configuringfurther comprises configuring an autonomic management element occupyingthe highest layer as the slave for the other autonomic managementelement.
 12. The method of claim 1, wherein: the arranging comprisesforming a lowest layer, a highest layer and an intermediate layer; andthe configuring further comprises configuring an autonomic managementelement occupying the intermediate layer: as the master for the otherautonomic element provided the other autonomic management elementoccupies a layer above the intermediate layer; and as the slave for theother autonomic element provided the other autonomic management elementoccupies a layer below the intermediate layer.
 13. A system for managinga computing system having hardware and software components, comprising:a processor; a non-transitory computer readable storage medium havingcomputer readable instructions stored therein for execution by theprocessor, causing the processor to: arrange the hardware and softwarecomponents of the computing system in a hierarchy of layers; launch twoautonomic management elements, each running in a different component ofthe computing system; configure the two autonomic management elements asa master and a slave, the master controlling management responsibilitiesof the slave, provided the two autonomic management elements are runningin different layers; and manage the hardware and software components ofthe computing system by the two autonomic management elements,comprising running the two autonomic management elements in amaster-slave mode.
 14. The system of claim 13, wherein the computerreadable instructions further cause the processor to launch, by theslave, an automatic discovery procedure, based on a communicationprotocol, to discover and communicate with the master.
 15. The system ofclaim 14, wherein the computer readable instructions further cause theprocessor, upon successful automatic discovery procedure, to registerthe slave with the master, and to report: a layer where the slave islocated; and other slaves for which the slave is a master.
 16. Thesystem of claim 15, wherein the computer readable instructions furthercause the processor to report: current resource profile of the slave;and current management responsibilities of the slave and the otherslaves.
 17. The system of claim 14, wherein the computer readableinstructions further cause the processor, upon successful automaticdiscovery procedure, to: accept the slave by the master; and delegateselected management tasks from the master to the slave.
 18. The systemof claim 17, wherein the computer readable instructions further causethe processor, upon successful automatic discovery procedure, to:redirect the slave to another master; or re-negotiate managementresponsibilities between the master and the slave.
 19. The system ofclaim 13, wherein the computer readable instructions further cause theprocessor to configure the two autonomic elements according to one ormore of the following: manual configuration; network-basedconfiguration; or direct memory access configuration.
 20. The system ofclaim 14, wherein the computer readable instructions further cause theprocessor: by the master, to listen for a connection request from theslave; and upon arrival of the connection request, to communicate withthe slave regarding a division of the management responsibilitiesbetween the master and the slave.
 21. The system of claim 14, whereinthe computer readable instructions further cause the processor: by theslave, to send a connection request to the master; and upon confirmationof the connection request, to communicate with the master regarding adivision of the management responsibilities between the master and theslave.
 22. The system of claim 13, wherein the computer readableinstructions further cause the processor to: arrange the hardwarecomponents in the lowest layer; and configure an autonomic managementelement occupying the lowest layer as the master for the other autonomicmanagement element.
 23. The system of claim 13, wherein the computerreadable instructions further cause the processor to configure anautonomic management element occupying the highest layer as the slavefor the other autonomic management element.
 24. The system of claim 13,wherein the computer readable instructions further cause the processorto: form a lowest layer, a highest layer and an intermediate layer; andconfigure an autonomic management element occupying the intermediatelayer: as the master for the other autonomic element provided the otherautonomic management element occupies a layer above the intermediatelayer; and as the slave for the other autonomic element provided theother autonomic management element occupies a layer below theintermediate layer.